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Audio Electronics III
Mid Term
52
Electrical Engineering
Undergraduate 2
08/11/2013

Additional Electrical Engineering Flashcards

 


 

Cards

Term
Voltage
Definition
Is the force of pressure in electrical current.
Term
Current
Definition
Is the measure of the flow of electrical charges.
Term
Resistance
Definition
Is the measure of an objects opposition to the flow of DC current in a circuit.
Term
Inductors
Definition
Store electrical energy in magnetic fields
Term
Conductors
Definition
Readily pass electical current because they have loose electrons that can easily move between atoms of the material.
Term
Semi-Conductors
Definition
Have an electrical conductivity that is between an insulator and conductor.
Term
Reactance
Definition

Is the measure of an objects opposition to the flow of current in a circuit.

 

Term
Impedance
Definition
Is the overall opposition to current presented by the circuit.
Term
Active Current (AC)
Definition

Reverses its flow at a certain frequency.

US - 60 Hz

Europe - 50hz

Term
Direct Current (DC)
Definition
Flows in one direction.
Term
Resistors
Definition
Limit the flow of electrical current
Term
Capacitors
Definition
Store DC electrical current electrostatically. Allows AC to pass but filters depending on frequency.
Term

Transformers

 

Definition
Transfer electrical energy from one circuit to another through inductively coupled conductors.
Term
Transistor
Definition
Is a semi conductor device with three connections, capable of amplification in addition to rectification.
Term
Diodes
Definition
Allow current to flow in one direction and mostly blocking it in the other.
Term

Series Circuit

[image]

Definition

If one lightbulb dies, the current stops flowing

 

Total Resistance of Circuit = R1 + R2 + R3 + R4

Term

Parallel Circuit

[image]

Definition

If one lightbulb dies, the current continues flow across the rest of the circuit.

 

[image]

Term
Kirchoff's Current Law
Definition
The algebriac sum of all currents entering and exiting a node must equal zero.
Term
Ohm's Law
Definition
Current: I = V / R
Volts: V = I x R
Resistance: R = V/I
Term
Electrical Charge (Unit)
Definition
Coulomb (C)
Term
Voltage (Unit)
Definition
Volt (V)
Term
Resistance (Unit)
Definition
Ohm (Ω)
Term
Sound Pressure (Unit)
Definition
Pascal (Pa)
Term
Power (Unit)
Definition
Watt (W)
Term
Capacitance (Unit)
Definition
Farad (F)
Term
Inductance (Unit)
Definition
Henry (H)
Term
Condenser Microphone Function
Definition
The diaphragm and the back plate have a voltage between them. When sound waves strike the diaphragm, the two plates move closer together increasing capacitance, and when they move apart, decreasing capacitance. This creates an AC output signal.
Term
Dynamic Microphone Function
Definition
As sound waves hit the diaphragm, the diaphragm vibrates the coil over the magnet, which creates an AC signal.
Term
Ribbon Microphone Function
Definition
Foil ribbon is suspended in a magnetic field. When sound vibrations move the foil, a current is produced which is "stepped-up" by a transformer.
Term
Piezo Function
Definition
High impedance device that creates electrical current potential and will create a change in voltage in response to a stress or hit.
Term
Speaker Function
Definition
AC signal signal causes vibration in the magnetic field of the inductor coil, which moves the magnet surrounding the coil, and vibrates the connected cone.
Term
Directivity Index and Directionality
Definition
the relation of on-axis pickup to the total pickup of the microphone in all directions. The higher the directivity index, the more directional the microphone.
Term
Proximity Effect
Definition
As a microphone is brought closer to a sound source, the bass response will increase.
Term
dB SPL (unit)
Definition
Sound Pressure Level
Term
dBv (unit)
Definition
Voltage (1V)
Term
dBu (unit)
Definition
Voltage (.775v)
Term
dBm (unit)
Definition
Power (1mw)
Term
dBFS (unit)
Definition
Full Scale (Digital)
Term
Mic Level in Millivolts (unit)
Definition
~2 Millivolts
Term
Line Level (unit)
Definition
0.5V - 2V
Term
Reference Level for Mic Measurement
Definition
Lp = 94dB = 1Pa
Term
Difference Between +4dBu and -10dBV
Definition
+4dBu is 1.23V, and -10dBV is .316V
Term
Weight used for SPL measurements
Definition
(A) weighting reduces the low frequencies more than (C), so (C) weighting is used for all studio measurements.
Term
Primary Mic Specs
Definition
Directionality, Frequency Response, Output Sensitivity, Output Source Impedance, Equivalent Self-Noise Level, Distortion Specifications, Dynamic Range, and Hum Pickup.
Term
Standard level and distance mic measurements are made at
Definition
1 meter at 94dB
Term
Modern mics are generally _____ impedance
Definition
Low
Term
A connection of a low impedance source to a high impedance load results in a _____ voltage transfer
Definition
Maxiumum
Term
Which type of microphone has the lowest self-noise rating
Definition
Dynamic Microphones
Term
Formula for Signal to Noise Ratio
Definition
94dB - Self Noise Level = S/N Ratio in dB
Term
Two reasons why it should be difficult to measure the THD of a mic in a classroom setting
Definition
A classroom is not an anechoic chamber, and 130db is damaging to the ear.
Term
How do you clean a Condenser microphone
Definition
Remove grill and tap to get excess dust out, clean grill with coarse brush, then using a small soft camel hair paintbrush, gradually push the particulates off the disk working in a circular fashion.
Term
The capacity of an inductor is determined by
Definition
The number of coils, the type of core, the cross sectional area of the coil, and the length of the coil.
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